/**
 * Section context resolver: determines current section from editor cursor position.
 */

import type { Editor } from "obsidian";
import { splitIntoSections } from "../mapping/sectionParser";

export interface SectionRef {
  file: string;
  heading: string | null;
}

export type ZoneKind = "content" | "note_links" | "candidates" | "root";

export interface SectionContext {
  file: string;
  heading: string | null;
  zoneKind: ZoneKind;
  sectionIndex: number;
}

const NOTE_LINKS_HEADING = "Note-Verbindungen";
const CANDIDATES_HEADING = "Kandidaten";

/**
 * Determine section context from editor cursor position.
 */
export function resolveSectionContext(
  editor: Editor,
  filePath: string
): SectionContext {
  const content = editor.getValue();
  const cursor = editor.getCursor();
  const cursorLine = cursor.line;

  const sections = splitIntoSections(content);

  // Find section containing cursor line
  let currentSectionIndex = -1;
  for (let i = 0; i < sections.length; i++) {
    const section = sections[i];
    if (!section) continue;
    if (
      section.startLine <= cursorLine &&
      cursorLine < section.endLine
    ) {
      currentSectionIndex = i;
      break;
    }
  }

  // If no section found, use root (content before first heading)
  if (currentSectionIndex === -1) {
    return {
      file: filePath,
      heading: null,
      zoneKind: "root",
      sectionIndex: 0,
    };
  }

  const currentSection = sections[currentSectionIndex];
  if (!currentSection) {
    return {
      file: filePath,
      heading: null,
      zoneKind: "root",
      sectionIndex: 0,
    };
  }

  // Determine zone kind based on heading
  let zoneKind: ZoneKind = "content";
  const heading = currentSection.heading;
  if (heading === NOTE_LINKS_HEADING) {
    zoneKind = "note_links";
  } else if (heading === CANDIDATES_HEADING) {
    zoneKind = "candidates";
  } else if (heading === null) {
    zoneKind = "root";
  }

  return {
    file: filePath,
    heading: heading,
    zoneKind,
    sectionIndex: currentSectionIndex,
  };
}